Telephone-exchange system



Dec. 29,1925;

, 7 1,567,094 5. B. WILLIAMS TELEPHONE EXCHANGE SYSTEM o i i l Filed Oct. 23, 1922 3 Sheets-Sheet 1 J Aff'y Dec. 29 1925.

s. B. WILLIAMS TELEPHONE EXCHANGE SYSTEM Original Filed Oct. 23, 1922 3 Sheets-Sheet 2 S. B. WILLIAMS TELEPHONE EXCHANGE SYSTEM o i l Filed Oct. 23, 1922 3 Sheets-Sheet 3 H mun "HUL nah Nu Nu n u. F I-l {P1 QM: R

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UNI-TED 1 ST ES? SPA-TENT, OFFHCE.

SAIvIUEL B. WILLIAMS, OF BROOKLYN, NEWiYORK, 'ASSIGNORTO NVESTERN ELECTRIC COMPANY, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

TELEPHONE-EXCHANGE SYSTEM.

Original application filed October 23, 1922, Serial ml 596,179. Patent No. 1,517,331, dated December 2,

To all whommay concern: Be it known that I, SAMUEL B. VV'ILLIAMs, a citizen of the United States of America, residing at Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Telephone-Exchange Systems, of which the following is a full, clear, concise, and exact description. Y

This invention relates to telephone ex change systems and more especially to sys-v tems of the class in which automatic switching apparatus is employed for extending automatic connections.

In telephone systems where message registration is employed for measuring the servic'erendered to subscribers lines, it is frequently necessary to provide for connections to certain classes of lines free of charge. Such lines as these are known as free lines and include lines extended to fire and police stations, hospitals and the like.

The object of this invention is, therefore, to enable the extension of calls to certain lines in the system without charge.

A feature of the invention relates to a system in which controlling mechanisms serve to govern the operation of selective switches together with means for setting up in such mechanisn'is a record of the fact that a particular line is being called and means rendered eflective according to such record for preventing the (all from being charged.

Another ilcature relates to a system hawing switches comprising a number of links for extending connections to called lines and a special link serving to prevent the charging of a call when the connection is extended to a line of a certain class.

This application is a division of the copending application of S. B. Williams, Serial No. 596, 179, filed October 23, 1922, Pat ent No. 1,517 ,331, issued December 2, 1924.

Referring to the drawing, Figs. 1, 2 and 3 with Fig.2 to the right of Fig. 1 and with Fig. 3 below Fig. 1 disclose a sufficient amount of a telephone exchange system embodying the features of this invention to enable an understanding thereof.

Fig. 1 discloses schematically a line switch in which subscribers lines appear together Divided and this application filed June 21, 1924.. Serial No. 721,377.

with one of'a number of trunks outgoing fromjsaid line switch.

Fig. 2 discloses schematically first and second group selector switches and also a final or connector switch having access to subscribers linesg-Th'is figure also shows diagrammatically connecting devices for associatiiig fa markerfwith the switches.

Fig. 31 at ,the left diagrammatically illustrates a: sender selector switch. Within the left-liandbroken area this figure also partially discloses"one of e number of common register senders. Vithin the right-hand broken rectangle there'is disclosed a portion of one of a number of markers which serves to control the selective operation of the switches. Thefigure also shows one of a number of connecting'fdevices for connecting the senders to theimarkers.

. The line switch.101 and selector switches 200, 202, 204: and'300 are of the coordinate type such as disclosed and described in the above mentioned application of S. B. Williams, Serial No. 596,179, filed October 23, 1922, PatentNo. 1,517,331, issued Dec. 2, 192 1. i

The subscribers"lines such as the line 100 appear in vertical rows of contacts in the line switches 101 which have access to trunks such as the trunk 113 leading. to the first group selectorswitches 200. Trunk 113 is seen appearing in the vertical row of contacts in the switch 200 and it will. be understood that other trunks similarly appear in the same switch; The selector 200 has access to trunks such. as the trunk 201 which appear in vertical rows of contacts of the group selector switches 202. Switches 202 have access to trunks such as the trunk 203 which, appear in vertical rows of contacts in connector switches 204.

The. particular trunk 203 is seen to appear at the vertical rowof contacts 206 in the switch 204 Another trunk incoming from one of the group? selectors is seen appearing in the vertical-row of'contacts 205. The connector switches 20 .Pa1so have rows of contacts such as rows 207, 208, etc. in which appear "subscribers lines;

The switch 204 has a number of horizontal link circuits which are divided up into a nector switches in such a n annerthat they are accessible each fQl'all the" links of a given group. For instance, the 'lin'e 209 is accestothelinksof the group 211. The line 210 is accessible to the links (if thegrcup 212. Likewise-other lines cach before all the horizontal links o'fonly' onc secti'o n or group. i I I The register senders 320. are selected by the sender selectorlswitch'i300 in response to the initiationfo f the call; and associated with the calling line. These register senders compriseinaddition to a registering eq uipm ent' 308, var ous controlling relays most of whichha've been; climb nated froni this disclosure since they arenot needed for an E of. the, .in'ven tion.

i Th r gister I se dersQar ,cop ec a through devices suchasQthe device 309 with a switch controlling m a-rker, one of which 330 is partially illi is' titated'.I,iv The inarker330 contains a registering equipment 310 which receives the record from. the. registers. 308 of the sender and'thereby :ggvc'rnsthe operation ofthe switches {20.21am 204ff't'o, extendv connection to. a called-subscribers, line. The manner in whiclrthe connection is extended from the line switch 101 through the first group. selector switch 200 and also, the manner in which the. switchcs2'00 and 204sare controlled by the marker 330 to further extend the. connection [to a called lineis fully disclosed and described the application of S. B. llillia ns. Serial No. 596,179,.filed Oc tober 23, 1922, Patent No.;1-,5 17,331, issued Dec. 2, 1924.

In order to better describethe manner in which the system functionswhen a call is made to a free line, it will first bev assumed;

that the subscriber of'line 100- desires to extend aconnection to a line 210, which call, ifsuccessful, will involve the operation of the subscribei"s message register 102. .There- I "after, a dcscriptionjwilhbe made of acallgto one of; the free lines. Up ouths. initiation of the call theline .l00iisextended through the'line switch to the idle trunk, 113 leading to the group selectorswitch 200a. The sender. selector switch 300 is alsooperated, andthe.v idle sender. 320 associated withthe calling. line. During the operation of. the sender;

selector 300 the relay 103-is operated. Relay 103 extends the calling. line 100 through jto the impulse relay 302 of the sender, the circuit including the balancing coil 303. Relay 302 operates the holding relay 305 which applies ground potential to the holding conductor 317: The slow' release holding. relay 108 or the trunk 'circuit is also operated at the time sender selector switch 300-operates and is held in a temporary holding circuit leading through the left front contact of relay 103, Relay 108 applies ground potential to the holding sleeve conductor 115.

After the calling subscriber has recorded the record on the registers 3080f the sender, the switch 200 is operated, whercafter the sender is connected through the device 300 with .the line. marker. 330 which proceeds to selectively control the operation ofthe switches 202 and 204 to establish connection to the called subscribers line 210.

Afte r. the connection has been completedand the subscribersline has been rung, the called subscriber responds, whereupon a circuit is completed for the operation of the supervisoryrelay 107 in the trunk circuit. This circuit extends through the right windings of the repeatingcoil 105. the. sender has been discharged and relay 103 releases to complete the calling subscribers line through to the left-hand windings, of the repeating coil 105, causing the operation ofv supervisory relay 106. Relay 106 at its,

front contact provides a substitute holding circuit for. the slow relay 108. lVhen relay At this time.

10Z operates it causes the operation of relay 111' to record the fact that the called subscriber has answered. The circuit for this relay leads from battery through its Winding, contact of relay 107, back contact of relay 109, contact to ground at the right contact of relay 108. Relay 111 operates and locks through its win-ding and right contact, right back contact of relay 112 to ground at the left contact of relay 108.

lVhen the subscribers have finished conversation and replaced their receivers on the switchhooks, relays 106 and 107 release. Relay 106 opens the holding circuit of relay 108, which being slow requires a substantial interval in which to retract its armatures. During this interval a circuit is completed for operating the slow release relay 112. This circuit leads from battery through the winding of relay 112, left contact of relay,

111 to ground atthe back contact of relay 106. Relay 112 operates and closes a circuit for energizing the magnet 102 of the message register. .This circuit leads from ground through the left contact of slow relay 112, conductorj'116, through contacts of the line; switchlOl, windingoff the magnet 1 02 to battery. Magnet 102 energizes and operatestheregister to charge the call.

After an interval hasv expired, relay 112 deenergizes. Thus, a time interval .is provi-ded to insure the full and complete operalow tion of the message register 102. The removal'of ground potential from the 0011; ductor 17-15 when the subscribers replace, their receivers brings about a release of the switches involved in theconnection.

It will now be assumed that a connection is desired with the line 209 which is a free line and accordingly no charge shouldbe made against the calling subscriber. In order to place the'line 209 on a free line basis, it is only necessary to wire the connecting block 220 in such a way that the conductor 221 which leads to the marker is connected to a contact on the line 209 associated with the common link 215.

The procedure is the san'ae n p to the point where the connector switch 204 is being operated. At the time the operating magnet 222 is energized to operate the common horizontal link 215 a circuit is closed for operating the free call relay 312 in the marker to record the fact that the connection being extended is one for which no charge should be made. The circuit for relay 312 may be traced from battery through its winding,

conductor 221, connecting block 220, through contacts of, the switch 204 in the vertical row 207, thence over the lower conductor of the link 215, thence through cont-acts of the switch 204 in the vertical row 206, conductor 223 to ground at the contact of the holding rel-ay311 in the marker. Relay 312 operates and looks through its right contact to the grounded conductor 223. Since the sender is connected to the marker at this time the relay 307 in the sender is operated to record the fact that the connection being extended is one directed to afree line. The circuit for relay 307 leads from battery through its winding, through the connecting device 309, conductor 314, to ground at the left contact of relay 312 in the marker. Relay 307 looks through its right contact to the grounded holding conductor 317 Later, when the sender is discharged at the completion of the connection through to the free line 209, the relay 109 in the trunk circuit is operated to disable the meter operating means. The circuit for relay 109 may be traced from battery through its winding, right front cont-act of relay 110, the latter relay being operated at this time, conductor 118, through the sender selector switch 300, conductor 315, front cont-act of relay 304, leftcontact of relay 307, contact of relay 306 to ground at the outer right contact of relay 301. The relays 301, 304 and 306 are operated at this time in the manner described in the application of S. B. Williams, Serial No. 596,179, filed October 23, 1922, Patent No. 1,517,331, issued Dec. 2, 1924. The relay 109 of the trunk circuit locks through its front contact to the grounded holding conductor 115.

When the called subscribe-r answers subsequently, relay-107 operates, but in this case the relay 111;fails,to energizeisince its operating circuitis-now broken-attire left back-. contact of relay 109. .Atithe. end oi: conversation when the subscribers ;replace their receivers, relay 10.6 releases, but since the relay 111 is deenergizedlno circuit is closed for the meter operatingrelay 112. Accordingly, the connection. is; released without having operated the calling subscribers message register 102.

It will bejnoted in connection .;withthe final switch204 that an ordinary lineunay be convertedinto a free line-.by; merely: wiring the connecting block such asJjthe-block 220 to make connection 1 with the conductor- In disclosing this invention the drawing has been simplified as, far-as-possible in order to obviatethe description of'parts of the system which are, non-essential .to the understanding of said inventionailior a full and complete disclosure 1 of ;a; system; of the character herein.I illustrated, reference; is made to the above mentioned application of S. B. VVilliams,.Serial No.l596,179,;filed October 23, 1922, PatentNo. 1,517,331-,-issued Dec. 2, 1924. j

What is claimed is j 1 1. In a telephone system a calling :line, a register for said line, ,cal1ed subscribers lines, selective switches for establishing connections between.thecalling-line and said called lines, a controlling mechanism for selectively governing the operation of said switches, means controlled by. one of said switchesior setting up a record in said mechanism when connections are, extended to certain ones of said called;;li11es,-.n1ea11s for operating said register, and means controlled by said-mechanism when said record is set up therein for disabling the registeroperating means.

2. In a telephone system, a calling linc, a message register for said line, called subscribers lines,- autol'naticswitches for extending connections from the calling line to said called lines, a recording and controlling mechanism common to said; switches for selectively governing the operation thereof, means responsive to the operation of said switchesfor establishing a record in said. mechanism when connections are extended to certain ones of said. called lines, means for operating said register, and means controlled by said mechanism when said record is established therein for disabling the register operating means.

3. In a telephone system, a calling line, a register for said line, called lines of difl'erent classes, selective switches for extending connections from the calling line to said called lines, a controlling device common to said lines and switches, means for associating said device with any switch for governing lit) the selective operation thereof, means for establishing a record in said controlling device in response to the extension of connection to a line'of a certain class, means for -operating said register, and means controlled by said device for rendering the register operating means ineffective.

4:. In a telephone system, a calling line, a message register for said line, a called line, selective switches for establishing connections between said lines, a register controlling mechanism for selectively governing the operation of said switches, means for operating said controlling mechanism in a discriminating manner in response to the extension of a connection to said called line, means for operating said message register, means responsive to the called line for preparing to operate said register operating means, and means controlled by said controlling mechanism for disabling said register operating means.

5.In a telephone system, a'calling subscribers line, a register for said line, a se lective switch, means for extending tlie'calling line to said switch, other lines outgoing from said switch, said switch having intermediate links for connecting the calling line to one of said outgoing lines, means for operating said register, and a separate link for such switch serving todisable the register operating means when a connection is extended to certain of'said outgoing lines.

6. In a telephone'system, a calling subscribers line, a register for said line, a selective switch, means for extending the calling line to said switch, other lines outgoing from said switch, said switch having intermediate links for connecting the calling line to one of said outgoing lines, means rendered eflfective by the completion of'the connection to certain outgoing lines for operating said register, and a separate link for said switch serving to disable the register operating means when a connection is extended to certain of said out-going lines.

'5. In a telephone system, a calling subscribers line, aregister for said line, a selective switch, means for extending a calling line to said switch, other lines outgoing from said switch, said switch having intermediate links for connecting the calling line to one of said outgoing lines, means rendered effective by the completion of the connection to certain outgoing lines for operating saidregister, and a separate link common toaliswitch having intermediate links for connecting the calling line to one of said outgoing lines, means for operating said register, aseparate link for said switch serving to establish a record in said sender when a connection is extended to certain of said outgoing lines, and means controlled by said sender for rendering said registcrs operating means ineffective.

9. In a telephone systenna calling subscribers line, a register for said line, called subscribers lilies, a selective switch, means for extending the calling line to said switch, a controlling mechanism for governing the operation of said switch, said switch having intermediate links for connecting the calling line to one of said called lines, a separate link for such switch, means controlled by said separate link for causing the operation of said controlling mechanism when certain ones of said called lines are called, means for operating said register, and means controlled by said mechanism for disabling the register operating means.

10. In a telephone system, a calling line,

a message register for said line, called subscribers lines, selective switches for establishing connections between the calling line and said called lines, a switch controlling marker for selectively governing the operation of said switches, a register sender for recording designations and arranged to cooperate wi'th said marker, means for setting up a record in said marker when connections are extended to certain ones of said called lines, means for controlling the sender marker, means for operating said message register, and means controlled by said sender when said record is set up therein for disabling said message register operating means.

In witness whereof, I hereunto subscribe my name this 9th day of June A. D., 1924.

SAMUEL B. WILLIAMS.

in accordance with such record in the 

